Mersen A070UD32TTI800 Protistor Fuse, 800A 700V AC, Size 32 aR, High-Speed Square Body with Striker - Pack of 3

The Mersen Protistor® A070UD32TTI800 (Item Number R300441) is a high-performance ultra-fast acting square body fuse-link designed for the robust protection of power semiconductor devices. This Size 32 aR class fuse is specifically engineered for heavy-duty industrial power electronics, including high-current rectifiers, large UPS systems, and industrial motor drives. It is optimized to provide maximum protection against short-circuit faults by significantly limiting I²t let-through energy, thereby safeguarding sensitive components like thyristors and SCRs.

The fuse features a high-grade ceramic body for superior thermal management and silver-plated contact surfaces to ensure minimal power loss. Its internal engineering utilizes pure silver elements embedded in high-purity quartz sand, facilitating extremely fast arc quenching and ensuring a high breaking capacity of 200kA. This model includes an integrated Type I mechanical striker, which serves as a visual trip indicator and can be used to actuate a microswitch for remote fault detection. The TTI flush-end M10 metric threaded design allows for a secure, low-impedance bolted connection directly to electrical busbars.

Technical Specifications

• Manufacturer: Mersen
• Catalog Number: A070UD32TTI800
• Item Number: R300441
• Amperage Rating: 800A
• Voltage Rating: 700V AC (IEC / UL)
• Interrupting Rating (Breaking Capacity): 200kA at 700V AC
• Operating Class: aR (Ultra-Fast Acting)
• Product Size: 32
• Mounting Configuration: Flush-End M10 Metric Threads (TTI)
• Indication System: Integrated Mechanical Striker (Type I)
• Pre-arcing I²t: 150 kA²s
• Total Clearing I²t at Rated Voltage: 1050 kA²s
• Power Dissipation at Rated Current: 140W
• Standards Compliance: IEC 60269-4, UL Recognized, RoHS Compliant
• Quantity: Pack of 3